Cryo treating doesn't harden the metal like Nitriding does - It does change
the metal, how you'll have to ask Chuck Gee here on the board. I use Cryo
treatment on all my brake parts including the pads. The Company Chuck works
for BodyCote does this and does all my cranks exclusively as well as many
aftermarket manufactures of cranks and such. The items all need to be
machined first and only polishing after since the heat treatment is only a
few thousands thick, as well as compensating for the metal swelling, if you
grind a crank after you would take away the treatment.
John W.
Spitfire #892 DP
240z CP3
----- Original Message -----
From: <spitfiresuz@141.com>
To: <charly@mitchelplumbing.com>; <larry.young@pobox.com>;
<fot@autox.team.net>
Sent: Thursday, October 13, 2005 12:30 PM
Subject: Re: Nitriding and Crankshaft Durability
> Hey all,
>
> Our resident cryo facility (okay, a mile down the road) always heat
> tempers
> the cryo-treated piece afterward, and recommends that machining be done
> AFTER the treatment. I would recommend cryo strongly over nitriding --
> nitriding apparently makes the surface of the metal harder, while cryo
> strengthens the metal by strengthening the bonds at the molecular level,
> through the entire piece. Larry -- you can check the archives for the
> piece I wrote the list a couple/few months back about cryo treatment, or I
> will be happy to send it to you when I get home to that computer.
>
> Susan :)
>
>
> Original Message:
> -----------------
> From: Charly Mitchel charly@mitchelplumbing.com
> Date: Thu, 13 Oct 2005 12:22:29 -0700
> To: larry.young@pobox.com, fot@autox.team.net
> Subject: Re: Nitriding and Crankshaft Durability
>
>
> Have you ever heard of cryogenically treating metal? It use the reverse
> process(kinda) or nitrating, cooling instead of heating. You don't have
> to
> do anything to the part to retrue it after treatment. I have a cryo
> treated
> crank in my TR6 for about 17 race weekends or the equivalent of about 2000
> race miles.
> ^Charly
> TR6 #44
>
>
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